You have never done an oil change??

The tankless hot water heaters that the villages install south of route 44 in the new section are not on demand heaters. In fact they can take longer to reach your preferred hot water setting, but once they reach that setting the hot water supply will never run out or get cooler. They also save space in your garage since they are mounted on the wall outside your house. Yes they should be serviced and yes you can do it yourself. Some neighborhood groups get together and buy the equipment then share it whenever they need it.
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Nothing I like better than having gas tankless water heater attached to side my house and have to do annual maintenance. Plus cost several times more.

Some people don’t keep car long enough to change oil. You can bet most leased car probably never got oil change, cause they know there going to get rid of in 3 years.

We're having a house built now. I had them upgrade the standard tankless heater to a recirculating heater with a return line. It will be as close to on demand as you can get.

I hope they insulate the lines to minimize your gas bill.

How does a recirculating heater with a return line work?

I had a tankless water heater on my house in north Florida. I YouTubed it and figured out how to do it. Very simple.

It basically provides a closed loop for the hot water to circulate.

Depending on the heater, there are several options to keep hot water in the line. Some you set on a timer. So if you know you shower everyday at the same time it will make sure you have hot water in the pipes at that time. Some you can just set by thermostat so there is hot water all the time (more spendy that way). And some newer models are computer controlled to the point that they "learn" your hot water usage patterns and circulate the hot water based on your use.

Retired and lazy
 

Or if you're lazy like me you can call:
Andy Twiss
(508) 726-5257
Every 12-18 months and have it done for about $50